Wow - there are so many music handling apps...I like Musixmatch (especially for the scrolling lyrics feature - excellent). Musixmatch (and most others I've tried) will display your onboard library several different ways, if you select 'Songs' and 'Play All' then it will play them in alphabetical order (or you can shuffle them by turning on 'Shuffle'). Musixmatch is free from Google Play :-)